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Patented Sept. 9, 1919.

H. G. GEISSINGER.

ELECTRlC CONTACT THERMOSTAT.

APPLICATION man 1AN.19.

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l H. G. GEISSINGER.

ELECTRIC CUNTACT THERMOSAT.

APPUCATION FILED 1AN.19.1918.

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HARRY G. GEISSINGER, 0F NEW YORK, N. Y., ASSIGNOR T0 THE PEOPLES STATE BANK, TRUSTEE, 0F DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

ELECTRIC-CONTACT THERMOSTAT.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application filed January 19, 1918. Serial No. 212,805.

To alt 'wlw/lt it may concern:

' Be it known that I, Hanny G. GEissINGEu, a citizen of the United States of America, residing at New York, in the county of New York and State of New York, have invent-ed certain new and useful Improvements in Electric-Contact Thermostats, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to electric Contact thermostats of lthe type in which the ,circuit is opened and closed by the lateral movement of an arch element in cooperation with one or more chord element-s having a. differential coefficient of expansion. It is the object of the invention to obtain a simple construction in which the arch element may be adjusted toward or from the cooperating electrical contact bearing without disturbing the relative adjustment between the arch element and the chord element which determines the curvature of the arch. The invention also has reference to various specifici features of construction as hereinafter set forth.

ln the drawings:

Figure l is a horizontal section through the thern'lost-at;

Fig. 2 is a plan viewthereof;

Fig. 3 is a side elevation; Fig. 4 1s a. cross-section on lme 4-4 Fig. 1;

Fig. 5 1s a. longitudinal section similar to a portion of Fig. l showing a modified construction; and

Fig. 6 is a cross-section thereof.

A is thc fraaie or base of the instrument. having the lugs B B B2 projecting therefrom. kC is a. cross-bar preferably of angle section, secured to the lugs B B by suitable means suc-h as the screws D and withV the interposition of suitable heat insulation E. F F are the chord elements, one end of each being attached to thc crossbar C while the opposite ends of said elements are secured to a flexible support (l, itself' attached to the base A by screws H with the interposition of heat insulating material l. Thus the chord elements are held in a fixed plane in relation to the base A. but heatronduction between the elements and the frame is limited by the insulating material.

'lhe arch clement J is arranged in substantially thc same plane 4but intermediate the chord elements F F', and one end of this y arch element is engage-d with a self-lining` bearing K. This bea-ring is preferably j formed of .a V-shaped member which is sejects through a central aperture in said member Gr, as shown in Fig. l. The member K is initially secured to the flange G by a rivet or other pivotal connection L, but after the bearing has become alined with the end of the arch it may be permanently secured by a drop ofsolder or other fastening means. The opposite end ofthe arch element engages a floating lug M, which is adjustable both parallelly and transversely of the plane of the'elements for the proper setting of the instrument. The block is provided with a notch M for en aging the end of the arch, and to permit o self-alinement the` opposite face of the block rests against a point bearing formed by a screw N engaging a threaded aperture in a lug or boss O on the cross-bar C. This point bearing is preferably in substantial alinement with and centrally of the notched bearing M', so that an adjustment of the screw to change the curvature or deflection of the arch may be effected-Without disturbing the al'inement of the bearing.

The vcoperating electric contact P is j mounted in an insulator P on the base A, being adjustable thereon by means of nuts P2 on opposite sides of theinsulator and en'- gaging threaded portions of the Contact. The arch element is also adjustable in relation to the contact member P, this being effected by a lateral adjustment of the floating block M through the medium of an adjusting screw Q. It is, however, necessary that during this lateral adjustment the face of the block which bears against the point contact N should be perpendicular to the plane of the elements, as otherwise there would b'e a variation in length between the bearings for the opposite ends of the arch which would change the curvature thereof. To obtain the result ust described the block M has secured thereto a spring R, the free end of which is laterally deflected and bears against a shoulder B3 on the lug B2. The opposite end of the spring projects slightly beyond the blockand engages a notch in a nut S engaging an adjusting screw T, which latter passes through a slot M2 in the block M and has its head swiveled in the lug B2. 'lhe arrangement is such that the rotation of the screw T will adjust the nut S thereon, said nut being held from rotation by its engagethe copftfi'ating contacts at a 'predetermined temperature.

It will be. noted that the block h1 floats in contact with the point bearings N and Q, so

5 ment with the spring R, while the tension of that it is free to rock or otherwis adjust 70 the spring R will be exerted to maintain the itself into alinement with the end ot the block M' in contact with the adjusting screws arch element bearing thereon. The tension N and Q. Thus after the screw N-is adjusted of the spring R tends to rotate the block to impart a given curvature or deflection to counter-clockwise, which in conjunction l0 the arch the screw T may be adjusted until with the other Vforces operating upon the 75 the face of the block M which bears against block will maintain the same against the the screw N is exactly perpendicular to the point bearings preventing any vibration or plane of the elements. When thus adjusted Change in adjustment. the screw Quiay be adjusted to move the end To avoid the necessity of a separate adot the arch so as to vary the distance of its justment of the screws T and N I may em- 80 center portion from the electric contact P ploy the construction shown in Figs. 5 and without disturbing the adjustment ot' the G, in which said screws have projecting arch curvature. The screw Q, passes through therefrom the laterallyextending arms N a threaded bearing in the frame A and has `and T'. These arms are interconnected by T attached thereto the dial Q which indicates suitable n'ieans, such as a pin N2 on the one 85 the temperature adjustment. Accidental roengaging a notch N3 upon the other, so that tation of the screw and dial is prevented by whenever one of the screws is adjusted it a brake formed by thespring clip U engagwill cause an adjustment of the other. The ing the screw Q and trictionally bearing relative length of the arms N' and T may against the peripheral portion of the dial. be proportioned to the relative pitches of the 90 The spring U is tensioned by engaging a threads on the screws N and. T so that the srrewthreaded stud V on which a nut V is lOHgUdHRl movement of one screw correadjustable and forms a bearing for the spends exactly to that of the other. As this spring. W is a bowed spring which is movement vis always very slightit may be sprung over the adjusting screw T and bears generally effected by the rotative adjust- 95 thereagainst to assist in maintaining the ment ot the screw through a limited' angle. block M in Contact with its adjusting screws. That l claim as my invention is:

T he bowed spring lV has its opposite ends l. In an electric contact thermostat, a slotted at Vv to slidab'ly engage headed "frame, a bar mounted on said frame, heat in- SCi-@WS T2 Secured to the basa sulation interposed between said bar and its 100 It is one of the objects of the construction mounting,'coperating arch and chord eleto avoid any lag in operation due to the mass ments, the latter being rigidly secured tosaid of material in the frame or mounting for bar, a bearing tor said arch element adjust the temperature elements. At the same time able in relation to said bar to vary the curva- 40 it is an object to avoid any inaccuracy which ture of the arch, a connection between the 105 n'iight be introduced by the interposition of opposite ends of saidarch and chord eleheat insulating material between the elements, anchoring means between said conments or their connections. I have aecoinnection and the frame tor maintaining the plished the desired result by placing the heat plane of the elements while permitting insulation only between the elements and movement in said plane, andheat insulation 11o their mounting upon the frame, but between between said anchoring means and the the arch and chord elements there are only traine. metallic connections. Consequently the ele In an electric contact thermostat, the ments when once adjusted will not vary their combination with a trame, of coperating relation to each other excepting as influenced arch and chord elements, the chord elements 115 by temperature, while the insulation placed being tixed 'in position relative to said traine, between the mass of metal in the frame and a contact .member mounted on said frame eX- tho cross-bar C and flexible support (l will tending in proximityY to said arch element, reduce heat conduction to a negligible an adjustable bearing t'or said arch element .55 mount comi/)rising a block, a point bearing tor said 120 In use, the screw N is first adjusted to block adjustable substantially in the plane of vary the curvature of the arch, after which said elements, and means i'or ymaintainingr the screw T is adjusted to correct the angusaid block in contact with said point bearlarity of the block M so that the face thereof ings in each position ot adjustment.

G0 bearing against the screw N is perpendicular 3. ln an electric contact thermostat, the 125 to the plane ot the elements. The dial Q eombiimtion with a traine. of cooperating may then be adjusted and will move the end arch and chord elements arranged in subof the arch element so as to vary the dis stantially the saine plane. a mounting tor tance between the central portion thereof said elements adapted to hold the chord clcand the contact P, thereby setting or closing ments constantly in the same plane, a con- 130 tact member` mounted on said frame extending in proximity to saidl arch clement, a block forming abcarng for one end of said said elements and having a point a plane parallel to the plane of said `elements and having a point contact on said block, and copcratnig means for resillently and yieldably pressing said block against said contact bearings in each position of adjustment thereof. l

4. In an electric contact thermostat, the combination with coperating` arch and chord elementsarranged in substantially the same plane, of a frame, means for mounting said elements upon said frametoinain-fv tain the chord elements thereof in a 'fixed ments at one end thereof ormaintaining the same .1n al1nement,lan electric contact for coperatingwitlirsaid arch element fixed to said frame, and means for adjusting the opposite endofA said arch elementn'com-prismg j alining'bear-,v ing for thcend of said'.element,fpointcbearf.y

a floating 'block' forming a self ings for said block vin 4planesfrespectively( parallel and perpendicular' :to `'tlfiegplane `of spective .plane and means ings in all posi 5. In an electric contactthermostat, the*` vcombination with lcoperating'A archy and chord elements arrangedin substantiallythe same plane, of amountingl for-maintaining the plane of the'chordelementspermitting. adjustment of one4 end of the arch element, and adjustment means orsaid end of the arch `element comprising aL j floating .block having a self alininglbearingfor the endof said arch element, a point bearing for said block adjustable*para-lleltothelplane of the `elements to `vary the lcurvature'of, the arch,

a point bearingfor saidblock adjustable perpendicular to lthe planeof the elements to varyk the position of a coperating contact andmeans for maintaining said block in contact with said points in all positionsof adjustmenty thereof. l

6. In an electric contact thermostat, the

combination with coperating arch and chord elements arranged in substantially the same plane, of a mounting for maintaining the plane of the chord elements permitting adjustment ofvone end of the archelement, a floating block. forming a self alining bearingfor lthe adjustable end of said `arch element one face of said block being perpendicular to the plane of said element, a oint bearing in contact With said face anda justable perpendicularljT thereof, means forcerrecting the angularity of said face with each adjustment of said point bearing to main-v tions ci ladj ustrnent thereof., i

con'lbination with cooperating arch and chOrdelementS, of a mountmg for said elements maintaining :the `Vchord elements thereof in a fixed plane while permitting adjustment of one endof said arch element,

Aand adjustment means for said end of the" arch element comprising a floating block notched to form a self-alining bearing for Ythev end of the archv element havingy one face perpendicular to' the plane `'of the element,

a point bearing incontactwith said face and Y' adjustable perpendicularly thereof to p n v varytheycurvatureof the arch, a springconplane, a connection between the chord ele-:f

nected to said block tensioned to maintain larlytotheplane ofsaid elements and bearing'upon said block against the tension of said spring.,y

j, In anrjelectric 'Contact thermostat, the -vcombin-ationff'with jcoperating arch and @chord .elements arranged in substantially n fthe same pl`ane,"fofa mounting for said elesaid :elements and adjustablev in their;ref;`

i formaintainingf l.said block in contact with said vpoint bear? ments comprising` a" frame and connections 1g-for'. maintaining `the chord elements in a .ffiXed-l plane in relation thereto while permitting" 'adjustment of one fend of the arch "element,V and adjustment 4means for said end of the arch element comprising av floating block having a self-alining bea-ring `for the end ofthe arclifelement, one facel of said block being/perpendicular `to the plane of said elements, a screw adjustable on said frame vperpendiculzu to said face and formingk a. point contact therefor, a screw adjustable on said vflame perpendicular to the planej'of saidI elements, a spring exerting a tension on saidblock to maintain the same in contact with said pointbearings in all posltions of adjustment thereof, and means y :for correcting thenangularity of said face the' arch in relation to or' the block whenadjusted by the screwl in contactithcrewith. 1 I

9. In an electric contact thermostat, the combination with coperating arch and chordelements arranged'in the same plane, of a mounting'for said 'elements comprising a fra-me and connections for Vnlaintaining the chord ele-monts in a fixedA plane while arch element, land adjusting means for said end of the arch `element comprising a. loating block for forming a self-alning bearing for said end of the arch element, one face of said bloclbeing perpendicular to the plane of Asaid elements, adjusting screws on said.

permitting adjustment of oneA end of the a screw parallel to the screw in contact with said face, and a spring for exerting a tension on said block to maintain the same in contact with said point bearings.

10. In an electric contact thermostat, the combination with a frame, of cooperating arch land chord elements arranged in the same pla-ne and mounted on said frame with freedom for adjustment of one end of the arch element, and adjusting means therefor comprising a floating block forming a selfalning `bearing for the end of said arch element, one face of said block being perpendicular to the plane of said elements, a screw-on said frame forming a point bearing for said face of the block and adjustable perpendicula-rly thereof, a screw adjustable in a plane perpendicular to the plane of said elements forming a point bearing on said block, a spring secured to said bloc-k and having a bearing on said frame, being tensioned to press the block into contact with said point bearings, a screw paralle] to the plane of said elements passing through a slot in said block, and a nut engaging said screw notched to enga e and bear upon the end of said spring, or the purpose described.

ll. In an electric contact thermostat, the combination with coperating arch and chord elements arranged in substantially the same plane, of a mounting for said elements comprising a. frame and connections for maintaining the chord elements in a fixed plane in relation thereto while permitting adjustment of one end of the arch element, adjusting means for one end of the arch element comprising a floating block having a self-alining bearing for the end of the arch element, one face of the block being perpendicular to the plane of said elements, a screw adjustable on said frame perpendicular to said face and formingl a point of contact therefor, a screw adjustable on said frame perpendicular to the plane of the ele- A ments, a spring exerting a tension on said block to maintain the same 1n contact with said point bearing in all positions of adjustment thereof, a screw parallel to the screw in contact with said face, a bea-ring for said block adjustable with said screw, and means connecting said parallel screws for compelling a corresponding adjustment thereof to maintain the angularity of said block during adjustment.

l2. In an electric contact thermostat, a

frame, coperating arch and chord elements,

the latter beingr rigidly secured to said frame at one end thereof, a bearing for said arch element adjacent the rigidly mounted end of the chord element, said hearing being adjustable in relation to the frame to vary the curvature of the arch` a connection between the other ends of said arch and chord elements, anchoring means between said .with said arch element fixed to connection and the frame for maintaining the plane of the elements while permitting movement in said plane, heat insulation between said anchoring means and the frame, and insulation between the rigidly mounted end of the chord element and the frame and between the adjacent end of the arch element and frame.

13. In an electric contact thermostat, the combination with a frame, of cooperating arch and chord elements mounted upon said frame, a contact member mounted on said frame extending in proximity to said arch element, a block forming a bearing for one end of said arch element, a screw adjustable on said frame in a direction perpendicular to .the plane of said element and having a point contact on said block, a screw adjustable in a plane parallel to the plane of said elements and having a point contact on said block, and cooperating means for resiliently and yieldably pressing said block against said -contact bearings in each position of adjustment thereof.

'14. In an electric contact thermostat, the combination with coperating arch and chord elements, of a frame supporting the same, an electric contact for coperating said frame, and means for adjusting one end of said arch element comprising a fioating block formin a. self-alining bearing for the end of sai element, pomt bearings for said block in planes respectively parallel and perpendicular to said elements and adjustable in their respective plane, and means for maintaining said block in contact with said point bearings in all positions of adjustment thereof.

15. In an electric Contact thermostat, the combination with coperating arch and chord elements, of a mounting therefor permitting adjustment of one end of the arch element, a floating block forming a selfalining bearing for said end of the'arch element, one face of said block being perpendicular to the plane of said element, a point bearing in contact with said face and adjustable perpendicularly thereof, means for correcting the angularity of said face with each adjustment of said point bearing to maintain said face perpendicular to the plane of the element, a point bearing for said block adjustable perpendicular to the plane of said element, and means for maintaining said block in contact with said point bearings.

A16. In anelectric contact thermostat, the combination with coperating arch and chord elements, of a mounting for said elements permitting adjustment of one end of Said arch element and adjustment means for lsaid end of the arch element comprising ay fioating block notched to form a self-alining bearing for said end of the arch elcment having one face perpendicular to the plane Iof the element, a point bearing in contact with said face and adjustable perpendicularly thereofI to vary the curvature of the arch, a spring connected to said block tensioned to maintain the same in Contact with said point-bearing, and a point bearin adjustable perpendicularly to the plane o said elements and bearing upon said block against the tension of said spring.

17. In an electric contact thermostat, the combination with coperating arch and chord elements, of a mounting for said elements comprising a frame and connection to said elements permitting adjustment of one end of the arch element and adjustment means for said end of the arch element com- Erisingr a floating block having a self-alining earing for said end of the arch element, one face of said block being perpendicular to the planev of said element, a screw adjust* able lon said frame perpendicular to said face and forming a point contact therefor, a screw adjustable on said frame perpendicular to the plane of said element, a spring exerting a tension on said block to maintain the same in contact with said point bearings in all positions of adjustment thereof, and means for correcting the angularity of said face of the block Whenadjusted by the screw in contact therewith.

In testimony whereof aliix my signature HARRY G. GEISSINGER. 

